/* PromiseHold - Design System */

:root {
    /* Colors */
    --color-bg: #0f0f12;
    --color-surface: #1a1a1f;
    --color-surface-elevated: #242429;
    --color-border: #2d2d35;
    
    --color-text: #f5f5f7;
    --color-text-secondary: #8e8e93;
    --color-text-muted: #636366;
    
    --color-primary: #6366f1;
    --color-primary-hover: #818cf8;
    --color-primary-subtle: rgba(99, 102, 241, 0.15);
    
    --color-success: #10b981;
    --color-success-subtle: rgba(16, 185, 129, 0.15);
    
    --color-warning: #f59e0b;
    --color-warning-subtle: rgba(245, 158, 11, 0.15);
    
    --color-danger: #ef4444;
    --color-danger-subtle: rgba(239, 68, 68, 0.15);
    
    /* Category Colors */
    --color-work: #3b82f6;
    --color-money: #10b981;
    --color-social: #f59e0b;
    --color-favor: #8b5cf6;
    --color-other: #6b7280;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    
    /* Borders */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
}

/* App Container */
.app {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--space-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    padding: var(--space-xl) 0;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary) 0%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Main Content */
.main {
    flex: 1;
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card.overdue .stat-number {
    color: var(--color-danger);
}

.stat-card.fulfilled .stat-number {
    color: var(--color-success);
}

/* Add Section */
.add-section {
    margin-bottom: var(--space-lg);
}

.add-btn {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-primary-subtle);
    border: 2px dashed var(--color-primary);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: var(--transition-base);
}

.add-btn:hover {
    background: var(--color-primary);
    color: white;
    border-style: solid;
}

.add-icon {
    font-size: var(--font-size-xl);
    font-weight: 300;
}

/* Add Form */
.add-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    animation: slideIn 0.2s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.form-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.close-btn {
    width: 32px;
    height: 32px;
    background: var(--color-surface-elevated);
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.close-btn:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.submit-btn {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
}

.submit-btn:hover {
    background: var(--color-primary-hover);
}

/* Tabs */
.tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    overflow-x: auto;
    padding-bottom: var(--space-xs);
}

.tab {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.tab:hover {
    background: var(--color-surface);
    color: var(--color-text);
}

.tab.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Promises List */
.promises-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* Promise Card */
.promise-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.promise-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
}

.promise-card[data-category="work"]::before { background: var(--color-work); }
.promise-card[data-category="money"]::before { background: var(--color-money); }
.promise-card[data-category="social"]::before { background: var(--color-social); }
.promise-card[data-category="favor"]::before { background: var(--color-favor); }
.promise-card[data-category="other"]::before { background: var(--color-other); }

.promise-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.promise-card.overdue {
    border-color: var(--color-danger);
    background: var(--color-danger-subtle);
}

.promise-card.fulfilled {
    opacity: 0.7;
    background: var(--color-success-subtle);
}

.promise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
}

.promise-person {
    font-weight: 600;
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.category-badge {
    font-size: var(--font-size-xs);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: var(--color-surface-elevated);
}

.promise-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
    line-height: 1.4;
}

.promise-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.promise-due {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.promise-due.overdue {
    color: var(--color-danger);
    font-weight: 500;
}

.promise-due.soon {
    color: var(--color-warning);
}

.promise-context {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-style: italic;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-2xl);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--space-md);
}

.empty-state h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-sm);
}

.empty-state p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    z-index: 100;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.2s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
    font-size: var(--font-size-lg);
}

.modal-body {
    padding: var(--space-lg);
}

.modal-detail {
    margin-bottom: var(--space-md);
}

.modal-detail-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-xs);
}

.modal-detail-value {
    font-size: var(--font-size-base);
    color: var(--color-text);
}

.modal-actions {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.modal-actions button {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-fulfill {
    background: var(--color-success);
    color: white;
}

.btn-fulfill:hover {
    background: #0ea572;
}

.btn-remind {
    background: var(--color-warning);
    color: white;
}

.btn-remind:hover {
    background: #d97706;
}

.btn-delete {
    background: var(--color-danger-subtle);
    color: var(--color-danger);
}

.btn-delete:hover {
    background: var(--color-danger);
    color: white;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-lg);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-sm);
    }
    
    .stat-card {
        padding: var(--space-sm);
    }
    
    .stat-number {
        font-size: var(--font-size-xl);
    }
}